CN112456917A - High-durability concrete and preparation method thereof - Google Patents
High-durability concrete and preparation method thereof Download PDFInfo
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- CN112456917A CN112456917A CN202011451632.1A CN202011451632A CN112456917A CN 112456917 A CN112456917 A CN 112456917A CN 202011451632 A CN202011451632 A CN 202011451632A CN 112456917 A CN112456917 A CN 112456917A
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- 239000004567 concrete Substances 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 238000005336 cracking Methods 0.000 claims abstract description 41
- 239000000654 additive Substances 0.000 claims abstract description 30
- 230000000996 additive effect Effects 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 23
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims abstract description 11
- DOOTYTYQINUNNV-UHFFFAOYSA-N Triethyl citrate Chemical compound CCOC(=O)CC(O)(C(=O)OCC)CC(=O)OCC DOOTYTYQINUNNV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims abstract description 11
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims abstract description 11
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000004575 stone Substances 0.000 claims abstract description 10
- 239000001069 triethyl citrate Substances 0.000 claims abstract description 10
- VMYFZRTXGLUXMZ-UHFFFAOYSA-N triethyl citrate Natural products CCOC(=O)C(O)(C(=O)OCC)C(=O)OCC VMYFZRTXGLUXMZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000013769 triethyl citrate Nutrition 0.000 claims abstract description 10
- 239000007864 aqueous solution Substances 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 12
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 10
- 244000060011 Cocos nucifera Species 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- -1 amide propyl dimethylamine ethyl lactone Chemical class 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000008961 swelling Effects 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 2
- 101001089018 Ulex europaeus Anti-H(O) lectin 1 Proteins 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 25
- 230000010220 ion permeability Effects 0.000 abstract description 15
- 238000009736 wetting Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 30
- ROSDSFDQCJNGOL-UHFFFAOYSA-N protonated dimethyl amine Natural products CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- RKDVKSZUMVYZHH-UHFFFAOYSA-N 1,4-dioxane-2,5-dione Chemical compound O=C1COC(=O)CO1 RKDVKSZUMVYZHH-UHFFFAOYSA-N 0.000 description 3
- AOMUHOFOVNGZAN-UHFFFAOYSA-N N,N-bis(2-hydroxyethyl)dodecanamide Chemical compound CCCCCCCCCCCC(=O)N(CCO)CCO AOMUHOFOVNGZAN-UHFFFAOYSA-N 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete, and particularly discloses high-durability concrete and a preparation method thereof. A high-durability concrete comprises water, cement, fly ash, slag powder, an expanding agent, machine-made sand medium sand, machine-made sand fine sand, stones and a composite anti-cracking anti-seepage additive; the composite anti-cracking and anti-seepage additive comprises an anti-cracking and anti-seepage reinforcing agent, hydroxypropyl cellulose, triethyl citrate and polyvinyl butyral; the preparation method comprises the following steps: adding the composite anti-cracking anti-seepage additive into water, and uniformly mixing to obtain an aqueous solution of the additive; mixing various aggregates, and adding 70% of additive aqueous solution for wetting; the other raw materials and the additive water solution with the rest 30 percent of dosage are added to prepare the additive. The high-durability concrete has the advantages that the chloride ion permeability resistance of the concrete is greatly improved, and the durability is obviously improved.
Description
Technical Field
The application relates to the technical field of concrete, in particular to high-durability concrete resistant to chloride ion permeation and a preparation method thereof.
Background
With the rapid development of economy, the construction industry of China is also rapidly developed, and the use amount of concrete is greatly increased. Corrosion of steel reinforcement is an important factor affecting the durability of concrete structures.
The main reason why the corrosion of steel bars affects the durability and safety of concrete structures is the penetration and diffusion of chloride ions. The addition of the fly ash and the slag powder can improve the chloride ion permeability resistance of concrete, particularly the double addition of the fly ash and the slag powder can obviously improve the chloride ion permeability resistance of the concrete, because the mineral admixture improves the microstructure and the composition of hydration products in the concrete, the blocking capability of the concrete on chloride ion transmission is improved, and the physical and chemical adsorption effect of the mineral admixture ensures that the concrete has stronger curing capability on chloride ions, is beneficial to reducing the transmission speed of the chloride ions in the concrete and improves the chloride ion permeability resistance of the concrete to a certain degree.
With the rapid development of the building industry in China, more and more cross-sea bridges and offshore infrastructures are built, but salt damage in a seawater environment is severe, corrosion of steel bars to a common concrete structure is severe, and the maintenance cost of the concrete building is increased to a great extent.
Disclosure of Invention
In order to improve the chloride ion permeability resistance of concrete, the application provides high-durability concrete and a preparation method thereof.
In a first aspect, the present application provides a high durability concrete, which adopts the following technical scheme:
the high-durability concrete comprises, by weight, 154 parts of water 152-; the composite anti-cracking and anti-seepage additive comprises an anti-cracking and anti-seepage reinforcing agent, hydroxypropyl cellulose, triethyl citrate and polyvinyl butyral, wherein the weight ratio of the anti-cracking and anti-seepage reinforcing agent to the composite anti-cracking and anti-seepage additive is 8 (0.4-0.6) to 0.4-0.6 (0.4-0.6).
By adopting the technical scheme, after the hydroxypropyl cellulose, the triethyl citrate and the polyvinyl butyral are simultaneously doped, the reaction rate of the anti-cracking and anti-seepage reinforcing agent and the calcium hydroxide in the cement paste is greatly enhanced, so that a large amount of ettringite expansion components are generated, the compactness of the concrete is improved, the chloride ion permeability resistance of the concrete is greatly improved, and the durability is obviously improved.
Preferably, the composite anti-cracking and anti-seepage additive also comprises cocoanut diethanolamide and cocamidopropyl dimethylamine ethyl lactone, wherein the weight ratio of the cocoanut diethanolamide to the anti-cracking and anti-seepage enhancer is (0.2-0.4):8, and the weight ratio of the cocamidopropyl dimethylamine ethyl lactone to the anti-cracking and anti-seepage enhancer is (0.2-0.4): 8.
By adopting the technical scheme, the water reducing and dispersing effects of the anti-cracking and anti-seepage reinforcing agent are enhanced, the water-cement ratio and the water consumption of the concrete are reduced, the compactness of the concrete is improved, the chloride ion permeability resistance of the concrete is further optimized, and the durability of the concrete is further improved.
Preferably, the anti-cracking and anti-seepage reinforcing agent is an HZ-2 type anti-cracking and anti-seepage reinforcing agent.
By adopting the technical scheme, the HZ-2 anti-cracking and anti-seepage reinforcing agent integrates the functions of high-efficiency water reduction, cracking resistance, seepage resistance, freezing resistance, slow setting, reinforcement and plasticization, has excellent comprehensive performance and improves the durability of concrete.
Preferably, the swelling agent is a UEA-I type swelling agent.
Preferably, the cement is P042.5 Portland cement.
By adopting the technical scheme, the cement is relatively stable and has low hydration heat.
Preferably, the slag powder is S95 grade slag powder.
By adopting the technical scheme, the mineral admixture improves the microstructure and the hydration product composition inside the concrete, improves the blocking capability of the concrete to chloride ion transmission, has stronger curing capability to chloride ions due to the physical and chemical adsorption effect, is favorable for reducing the transmission speed of the chloride ions inside the concrete, and further improves the chloride ion permeation resistance of the concrete.
Preferably, the stones are 5-25mm continuous graded broken stones.
By adopting the technical scheme, the shrinkage of the concrete is reduced, and the durability of the structure is improved.
Preferably, the fly ash is type II fly ash.
By adopting the technical scheme, the fly ash mineral admixture has a plurality of comprehensive effects such as 'activity effect', 'interface effect', 'micro-filling effect' and 'water reducing effect'.
In a second aspect, the preparation method of the high-durability concrete provided by the application adopts the following technical scheme:
a preparation method of high-durability concrete resisting chloride ion penetration comprises the following steps:
(1) adding the composite anti-cracking anti-seepage additive into water, and uniformly mixing to obtain an aqueous solution of the additive;
(2) mixing the stones, the machine-made sand medium sand and the machine-made sand fine sand, adding the mixture into a stirrer, and stirring for 15-20 seconds to uniformly mix the aggregates;
(3) adding 70% of the water solution of the additive into the stirrer, and stirring for 10-15 seconds to wet the mixed aggregate;
(4) adding cement, slag powder, fly ash and an expanding agent into a stirrer and stirring for 30-40 seconds;
(5) and adding the water solution of the additive with the residual 30 percent of the dosage into a stirrer, and stirring for 1-2 minutes to obtain the high-durability concrete.
By adopting the technical scheme, the composite anti-cracking and anti-seepage reinforcing agent is firstly put into water to prepare the additive aqueous solution, so that the dispersibility of the composite anti-cracking and anti-seepage reinforcing agent in concrete is improved, and the self-action is fully exerted;
mixing the stones, the machine-made sand medium sand and the machine-made sand fine sand, adding 70% of additive aqueous solution, uniformly mixing to fully wet the aggregate, and enabling the aggregate to be easily combined with the gel material;
the cement, the slag powder, the fly ash, the expanding agent and other raw materials are mixed, and then the additive aqueous solution with the residual 30 percent of the dosage is added, so that the cement, the slag powder, the fly ash, the expanding agent and other raw materials are more uniformly fused.
In summary, the present application has the following beneficial effects:
1. meanwhile, after the hydroxypropyl cellulose, the triethyl citrate and the polyvinyl butyral are doped, the reaction rate of the anti-cracking and anti-seepage reinforcing agent and calcium hydroxide in the cement paste is greatly enhanced, so that a large amount of ettringite expansion components are generated, the compactness of the concrete is improved, the chloride ion permeability resistance of the concrete is greatly improved, and the durability is obviously improved;
2. the water reducing and dispersing effects of the anti-cracking and anti-seepage reinforcing agent are enhanced, the water-to-gel ratio and the water consumption of the concrete are reduced, the compactness of the concrete is improved, the chloride ion permeability resistance of the concrete is further optimized, and the durability of the concrete is further improved;
3. the HZ-2 anti-cracking and anti-seepage reinforcing agent integrates the functions of high-efficiency water reduction, cracking resistance, seepage resistance, freezing resistance, retardation, reinforcement and plasticization, has excellent comprehensive performance and improves the durability of concrete.
Detailed Description
The present application will be described in further detail with reference to examples.
TABLE 1 sources of raw materials
| Raw materials | Manufacturer of the product |
| Cement | Hebei Shenghua environmental protection science and technology Co., Ltd |
| Fly ash | TIANJIN GUOHUA PANSHAN POWER GENERATION Co.,Ltd. |
| Slag powder | TANGSHAN GANGLU IRON & STEEL Co.,Ltd. |
| Expanding agent | TIANJIN BAOMING Co.,Ltd. |
| Machine-made sand medium sand | Xinglong Chengtai building materials Co Ltd |
| Machine-made fine sand | Xinglong Chengtai building materials Co Ltd |
| Stone | Xinglong Chengtai building materials Co Ltd |
| Anti-cracking seepage-proofing reinforcing agent | HEBEI HEZHONG BUILDING MATERIALS Co.,Ltd. |
| Hydroxypropyl cellulose | HEBEI HAOSHUO CHEMICAL Co.,Ltd. |
| Citric acid triethyl ester | Beijing Han Longda science and technology development Co., Ltd |
| Polyvinyl butyral | Tianjin Huachang-derived Industrial and trade Co Ltd |
| Coconut diethanolamide | Haian national force chemical Co., Ltd |
| Cocamidopropyl dimethylamine caprolactone | Shanghai De Ling chemical Co., Ltd |
TABLE 2 formulation of a highly durable concrete provided in examples 1-8 (unit: Kg)
TABLE 3 formulation tables (unit: Kg) for a highly durable concrete as provided in comparative examples 1 to 10
The high-durability concrete provided by the above examples and comparative examples is prepared by the following preparation method.
The preparation method of the high-durability concrete comprises the following steps:
(1) adding the composite anti-cracking anti-seepage additive into water, and uniformly mixing to obtain an aqueous solution of the additive;
(2) mixing the stones, the machine-made sand medium sand and the machine-made sand fine sand, adding the mixture into a stirrer, and stirring for 15-20 seconds to uniformly mix the aggregates;
(3) adding 70% of the water solution of the additive into the stirrer, and stirring for 10-15 seconds to wet the mixed aggregate;
(4) adding cement, slag powder, fly ash and an expanding agent into a stirrer and stirring for 30-40 seconds;
(5) and adding the water solution of the additive with the residual 30 percent of the dosage into a stirrer, and stirring for 1-2 minutes to obtain the high-durability concrete.
The above examples and comparative examples were subjected to various property tests, and the test results are shown in tables 4 and 5.
The concrete durability is carried out according to GB/T50082-2009 Standard test method for long-term performance and durability of ordinary concrete and JGJ/T193-2009 evaluation Standard for concrete durability test.
The method for testing the compressive strength of the concrete is carried out by GB/T50081 Standard test method for mechanical properties of common concrete.
TABLE 4 chloride ion Permeability test results (Current Capacity method Q-IV) (Unit C)
| First sample piece | Second sample piece | Third sample piece | Mean value of | |
| Example 1 | 623 | 628 | 625 | 625 |
| Example 2 | 569 | 572 | 583 | 575 |
| Example 3 | 621 | 618 | 627 | 622 |
| Example 4 | 631 | 615 | 623 | 623 |
| Example 5 | 628 | 617 | 632 | 626 |
| Example 6 | 536 | 522 | 521 | 513 |
| Example 7 | 486 | 467 | 459 | 471 |
| Example 8 | 508 | 517 | 503 | 509 |
| Comparative example 1 | 678 | 689 | 695 | 687 |
| Comparative example 2 | 685 | 693 | 675 | 684 |
| Comparative example 3 | 672 | 684 | 656 | 671 |
| Comparative example 4 | 669 | 687 | 674 | 677 |
| Comparative example 5 | 656 | 667 | 689 | 671 |
| Comparative example 6 | 698 | 676 | 673 | 682 |
| Comparative example 7 | 677 | 658 | 663 | 666 |
| Comparative example 8 | 578 | 587 | 569 | 578 |
| Comparative example 9 | 568 | 571 | 586 | 575 |
| Comparative example 10 | 583 | 574 | 571 | 572 |
As can be seen from Table 4, the high-durability concrete provided by the embodiment of the application has very high chloride ion permeability resistance, and the electric flux passing through the concrete sample piece can reach 650 ℃ or less; and example 7 is the best embodiment, and example 2 is the preferred embodiment.
The difference between the examples 2 and 4 to 5 lies in that the weight ratio of the ingredients used for forming the composite anti-cracking and anti-seepage additive is different, and the detection result shows that: when the weight ratio of the hydroxypropyl cellulose, the triethyl citrate, the polyvinyl butyral to the anti-cracking seepage-proofing reinforcing agent is 0.5:0.5:0.5:8, the high-durability concrete provided by the application has higher chloride ion permeability resistance. The test results of the comparative example 2 and the comparative examples 1 to 7 show that the hydroxypropyl cellulose, the triethyl citrate and the polyvinyl butyral are simultaneously doped to synergistically improve the chloride ion permeability resistance of concrete, and the three are not indispensable. The method is characterized in that hydroxypropyl cellulose, triethyl citrate and polyvinyl butyral are simultaneously doped, so that the reaction rate of the anti-cracking and anti-seepage reinforcing agent and calcium hydroxide in the cement paste can be cooperatively controlled, the speed of generating the ettringite expansion component is better matched with the drying rate of the concrete, and the compactness of the concrete is improved.
It can be seen from comparative examples 2, 6-8 and comparative examples 8-9 that the simultaneous incorporation of cocodiethanolamide and cocamidopropyl dimethylamine glycollide can further improve the chloride ion permeability resistance of concrete, and neither of them is acceptable. The reason is that after the coconut diethanolamide and the cocamidopropyl dimethylamine ethyl lactone are simultaneously added, the water reducing and dispersing effects of the anti-cracking and anti-seepage reinforcing agent are enhanced, the water-gel ratio and the water consumption of the concrete are reduced, and the compaction degree of the concrete is improved.
As can be seen from comparative example 7 and comparative example 10, it was demonstrated that the chloride ion permeability resistance of the concrete into which hydroxypropylcellulose, triethyl citrate, polyvinyl butyral, cocodiethanolamide, cocoamidopropyl dimethylamine glycolide were simultaneously incorporated was higher than that of the concrete into which cocodiethanolamide, cocoamidopropyl dimethylamine glycolide were simultaneously incorporated.
TABLE 5 test results of various properties of the concretes in examples 1 to 6 and comparative examples 1 to 10
| Detecting items | Apparent density, kg/m3 | 28d compressive strength, MPa | Slump, mm |
| Example 1 | 2390 | 51.2 | 205 |
| Example 2 | 2410 | 52.3 | 210 |
| Example 3 | 2400 | 51.6 | 205 |
| Example 4 | 2390 | 50.9 | 205 |
| Example 5 | 2400 | 51.3 | 205 |
| Example 6 | 2430 | 53.2 | 215 |
| Example 7 | 2450 | 54.6 | 220 |
| Example 8 | 2440 | 53.8 | 215 |
| Comparative example 1 | 2380 | 49.9 | 200 |
| Comparative example 2 | 2390 | 49.6 | 200 |
| Comparative example 3 | 2390 | 50.1 | 200 |
| Comparative example 4 | 2390 | 50.4 | 200 |
| Comparative example 5 | 2380 | 49.8 | 200 |
| Comparative example 6 | 2380 | 49.7 | 200 |
| Comparative example 7 | 2390 | 50.0 | 200 |
| Comparative example 8 | 2410 | 51.2 | 205 |
| Comparative example 9 | 2410 | 51.4 | 205 |
| Comparative example 10 | 2390 | 51.6 | 205 |
As can be seen from table 5, the strength of the high-durability concrete of the present application can be improved when the hydroxypropyl cellulose, the triethyl citrate and the polyvinyl butyral are compounded, and none of the three components is acceptable; and the strength of the high-durability concrete can be further optimized when the cocoanut oil diethanol amide and the cocoanut oil aminopropyl dimethylamine ethyl lactone are compounded.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A high-durability concrete is characterized in that: the raw materials comprise, by weight, 154 parts of 152-154 parts of water, 302 parts of 300-302 parts of cement, 76-78 parts of fly ash, 76-78 parts of slag powder, 55-57 parts of expanding agent, 436 parts of 434-436 parts of machine-made sand medium sand, 291 parts of machine-made sand fine sand 289-963 parts of stone and 14-17 parts of composite anti-cracking anti-seepage additive; the composite anti-cracking and anti-seepage additive comprises an anti-cracking and anti-seepage reinforcing agent, hydroxypropyl cellulose, triethyl citrate and polyvinyl butyral, wherein the weight ratio of the anti-cracking and anti-seepage reinforcing agent to the composite anti-cracking and anti-seepage additive is 8 (0.4-0.6) to 0.4-0.6 (0.4-0.6).
2. The high durability concrete of claim 1, wherein: the composite anti-cracking and anti-seepage additive also comprises cocoanut oil acid diethanolamide and cocoanut oil amide propyl dimethylamine ethyl lactone, wherein the weight ratio of the cocoanut oil acid diethanolamide to the anti-cracking and anti-seepage reinforcing agent is (0.2-0.4):8, and the weight ratio of the cocoanut oil amide propyl dimethylamine ethyl lactone to the anti-cracking and anti-seepage reinforcing agent is (0.2-0.4): 8.
3. The high durability concrete of claim 1, wherein: the anti-cracking and anti-seepage reinforcing agent is an HZ-2 type anti-cracking and anti-seepage reinforcing agent.
4. The high durability concrete of claim 1, wherein: the swelling agent is UEA-I type swelling agent.
5. The high durability concrete of claim 1, wherein: the cement is P. 042.5 Portland cement.
6. The high durability concrete of claim 1, wherein: the slag powder is S95-grade slag powder.
7. The high durability concrete of claim 1, wherein: the stones are 5-25mm continuous graded crushed stones.
8. The high durability concrete of claim 1, wherein: the fly ash is II type fly ash.
9. The method for producing a highly durable concrete according to any one of claims 1 to 8, wherein: the method comprises the following steps:
(1) adding the composite anti-cracking anti-seepage additive into water, and uniformly mixing to obtain an aqueous solution of the additive;
(2) mixing the stones, the machine-made sand medium sand and the machine-made sand fine sand, adding the mixture into a stirrer, and stirring for 15-20 seconds to uniformly mix the aggregates;
(3) adding 70% of the water solution of the additive into the stirrer, and stirring for 10-15 seconds to wet the mixed aggregate;
(4) adding cement, slag powder, fly ash and an expanding agent into a stirrer and stirring for 30-40 seconds;
(5) and adding the water solution of the additive with the residual 30 percent of the dosage into a stirrer, and stirring for 1-2 minutes to obtain the high-durability concrete.
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| CN202011451632.1A CN112456917A (en) | 2020-12-09 | 2020-12-09 | High-durability concrete and preparation method thereof |
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| CN202011451632.1A CN112456917A (en) | 2020-12-09 | 2020-12-09 | High-durability concrete and preparation method thereof |
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| CN202011451632.1A Pending CN112456917A (en) | 2020-12-09 | 2020-12-09 | High-durability concrete and preparation method thereof |
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Application publication date: 20210309 |